Tag: bioretention system

Bioretention is the process in which contaminants and sedimentation are removed from stormwater runoff. Stormwater is collected into the treatment area which consists of a grass buffer strip, sand bed, ponding area, organic layer or mulch layer, planting soil, and plants. Runoff passes first over or through a sand bed, which slows the runoff’s velocity, distributes it evenly along the length of the ponding area, which consists of a surface organic layer and/or groundcover and the underlying planting soil. The ponding area is graded, its center depressed. Water is ponded to a depth of 15 cm (5.9 in) and gradually infiltrates the bioretention area or is evapotranspired.

Green Infrastructure Sizing Criteria Development

It was the early 1950s and Johnny, who came marching home, wanted a two-bedroom ranch in a tidy neighborhood. From a stormwater (OK, “drainage”) perspective, “tidy” meant efficient drainage with curbed streets. The Rational Method was king. Calculate the 10-year peak flow. Size a pipe to get it to a

Keeping a LID on Onsite Treatment

Keeping a LID on Onsite Treatment

Low-impact development (LID) for stormwater management becomes a bigger challenge when a site has limited space. Such is the case at a high-profile sports project in California’s San Francisco Bay Area. The site of a new stadium for the National Football League’s San Francisco 49ers in Santa Clara, CA, used

Restoring the Chesapeake Bay Watershed

Restoring the Chesapeake Bay Watershed

Some parts of the Chesapeake Bay are pristine, but other sections are so full of silt and runoff that they appear muddy even at ground level. Years of unregulated agricultural runoff, the growing amount of impervious surface from suburban sprawl, and the bureaucracy of several states intertwined with their own

Dealing With Runoff

Dealing With Runoff

Alpharetta, GA, lies at the northern edge of the metropolitan Atlanta area and is the home to a beautiful environmental park known as Rock Mill Park. “It’s basically a BMP demonstration site,” says Michael Breedlove of Breedlove Land Planning Inc. in Conyers, GA. “We had the opportunity to work with

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